茶园中柑橘始叶螨及其天敌的发生特点

为了明确柑橘始叶螨[Eotetranychus kankitus (Ehara)]及其天敌在茶园中的发生规律，为防治策略的制定提供参考数据。本研究针对重庆发生柑橘始叶螨的茶园进行为期1年的系统调查，并在室内测定了优势天敌捕食螨的捕食功能反应。结果表明：柑橘始叶螨在田间的种群数量少于茶跗线螨，但其主要在4—5月发生危害，对茶产业的影响较大；茶园天敌主要有巴氏新小绥螨和尼氏真绥螨，其中尼氏真绥螨对柑橘始叶螨有明显的跟随现象，在柑橘始叶螨的盛发期为优势天敌；室内测定尼氏真绥螨对柑橘始叶螨各螨态的捕食功能反应属于HollingⅡ型，取食幼若螨所需时间最短为1.08 h，且1天内取食高达55头。

Eotetranychus kankitus (Acari: Tetranychidae) and Its Natural Enemies: The Occurrence Characteristics in Tea Plantation

The paper aims to clarify the occurrence regularity of Eotetranychus kankitus (Ehara) and its natural enemies in tea plantations, and provide reference for the prevention and control of the pest mites. Aone-year systematic investigation was conducted on Eotetranychus kankitus in Chongqing tea plantation, andthe predation function of predator mites was determined. The results showed that the population of E. kankituswas less than that of Polyphagotarsonemus latus in tea garden, but E. kankitus mainly occurred in April toMay and caused more serious damage to the tea industry. In tea plantation, there were two predatory mites,Neoseiulus barkeri and Euseius nicholsi, and E. nicholsi was the dominant natural enemy in the peakoccurrence period of E. kankitus, and showed an obvious following phenomenon. The result of indoormeasurement was that the predation function of E. nicholsi to E. kankitus was the Holling Ⅱ type. Theminimum time required for E. nicholsi feeding larva and nymph mite was 1.08 h and the maximum intake was55 mites per day.